Natsuo's life suddenly becomes more complicated when his father comes home and announces he has remarried a woman with two daughters whom Natsuo has met before. They're Hina, his teacher and unrequited crush, and Rui, a girl he previously slept with.

Natsuo has mixed feelings about a new classmate. Later, Hina receives a mysterious call that leaves her emotional and Natsuo concerned.

Rui makes a new friend with a notorious reputation - and an uncomfortable attraction to Natsuo.

Crime doesn't pay and the punishment doesn't always fit the crime - a lesson Natsuo experiences firsthand after 'borrowing' a book from the library.

Hina puts her plan to move out into motion. Neither Rui nor Natsuo wants her to leave, albeit for different reasons. Will their home feel the same without Hina in it?

Natsuo takes a tumble down a flight of stairs, but a broken leg is the least of his worries when he's caught in a lie by Rui.

Rui makes a decision after her conversation with Natsuo. Later, Natsuo's class takes a field trip to Okinawa, where feelings are laid bare beneath the light of fireworks.

When the unthinkable happens, Hina expresses her love for Natsuo the only way she can: by giving him a chance to move on.